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Fenniken, please revise this first post. RMTs are meant to have description about the roles of your team, and no one wants to go through those pictures to figure out your team. Just copy and paste it from Showdown.

I'm pretty sure Hyrdeigon learns a poison type move of some kind (Poison Jab maybe?) if you want a Poison attack use that instead but really Flash Cannon would give you better coverage with your Dark STAB and Steel types can't switch in for free.

Sylveon is fine I guess but I would put wish on their at least to heal it and your teammates...probably over Toxic

Give greninja mystic water, an as far as moves go replace night slash with nasty plot, and blizzard with ice beam. Change surf I scald, or aqua jet(if it can learn ot).Also give it Torrent as an ability. Then make it's stats this: 252-SpAtk 252-SpDef 4-Spd. Use it as a bulky special attacker.